Grease a 2-quart casserole dish and line bottom with chilies. Spread cheeses into a medium bowl after mixing flour, salt, eggs and evaporated milk in same bowl; mix well. Spoon this mixture over the chilies; bake uncovered in a preheated 350°F. oven for 30 minutes on center shelf. Spread tomato sauce on top and return to oven for 5 minutes. Serve with warmed tortillas and refried beans and/or Mexican rice. Reheats well.